Castle Rock, Town of Public Water System ID: C00118010
Transcript of Castle Rock, Town of Public Water System ID: C00118010
Castle Rock, Town of Public Water System ID: C00118010
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Well CR117 CS1A Well GW RWRWTF
Well CRS-227 Well GW FWTP
Well CR-228 Well GW PCWPF
Well CR-226 Well GW FWTP
Well 28R Meadows A-2R Well GW MWTP
Well CR217 Well GW RWRWTF
Well CR218 Well GW RWRWTF
Well 15R Well GW PSMWTP
Well 16R Well GW PSMWTP
Well CR72R Castle Oaks 6 Arapahoe Well GW RWWTF
Well CR83 Well GW MWTP
Well CR86 Well GW MWTP
Well CR51A Meadows D-7A Well GW RWRWTF
Well 219 A13 Well GW MWTP
Well 148 Den4 Well GW MWTP
Well 168 LDA4 Well GW MWTP
Well 191 (AL-8) Well GW UDI Surface PCWPF
Well CR14R PC Miller East Well GW PSMWTP
Well 31R Well GW RWRWTF
Well 33R Enderud Well GW RWRWTF
Well 41 Weaver 1 Well GW FWTP
Well 82 A4 Well GW MWTP
Well 111 Well GW RWRWTF
Well 124 Well GW RWRWTF
Well 170 Meadows DA6 Well GW MWTP
Well 174 Meadows D6 Well GW MWTP
Well 204 Well GW PCWPF
Well CR-229 Well GW PCWPF
Plum Creek Diversion No. 1 Intake Surface PCWPF
Well CR 199—AL 16 Well GW UDI Surface PCWPF
Well 50R Well GW MWTP
Well CR220 Well GW MWTP
Purchase Castle Pines Metro
CO0118005 CC GW DIST
Well CR 201-AL 18 Well GW UDI Surface PCWPF
Well CR 203-AL 20 Well GW UDI Surface PCWPF
WISE Purchase from Parker WSD CC Surface RWRWTF
Well CR221 Well GW MWTP
Well CR101 CSID Well GW RWRWTF
Well CR222 Well GW MWTP
Well CR223 Well GW RWRWTF
Well CR224 Well GW RWRWTF
Well CR225 Well GW RWRWTF
Well CR118 Well GW RWRWTF
Well CR105 Well GW RWRWTF
Well CR123 Well GW RWRWTF
Well CR110 Well GW RWRWTF
Well 11R Well GW UDI Surface PCWPF
Well 13R Well GW UDI Surface PCWPF
Well 184 (AL-1) Well GW UDI Surface PCWPF
Well 185 (AL-2) Well GW UDI Surface PCWPF
Well 192 (AL-9) Well GW UDI Surface PCWPF
Well CR72R Castle Oaks 6 Denver Well GW MWTP
Well CR84 Meadows A7 Denver Well GW MWTP
Well CR101 CSID Well GW RWRWTF
Well CR222 Well GW MWTP
Well CR223 Well GW RWRWTF
Well CR224 Well GW RWRWTF
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Well CR225 Well GW RWRWTF
Well CR118 Well GW RWRWTF
Well CR105 Well GW RWRWTF
Well CR123 Well GW RWRWTF
Well CR110 Well GW RWRWTF
Well 11R Well GW UDI Surface PCWPF
Well 13R Well GW UDI Surface PCWPF
Well 184 (AL-1) Well GW UDI Surface PCWPF
Well 185 (AL-2) Well GW UDI Surface PCWPF
Well 192 (AL-9) Well GW UDI Surface PCWPF
Well CR72R Castle Oaks 6 Denver Well GW MWTP
Well CR84 Meadows A7 Denver Well GW MWTP
Well CR152 Meadows A7 Dawson Well GW MWTP
Well 12R Redrilled Well GW UDI Surface PCWPF
Purchased The Pinery WSD
CO0118025 CC GW DIST
Well CR-230 Well GW PCWPF
Well CR21 Mikelson Den1 Well GW FWTP
Well 22 Mikelson DA1 Well GW FWTP
Well CR20 Mikelson A1 Well GW FWTP
Well CR27 out of service Well GW
Well 43 Weaver A2 Well GW FWTP
Well 44 Weaver LDA2 Well GW FWTP
Well 45 Weaver D2 Well GW FWTP
Well CR47 Meadows D1 Well GW MWTP
Well 49 Meadows A8 Well GW MWTP
Well 78 PC Alluvium Well GW UDI Surface PCWPF
Well 79 PC Alluvium Well GW UDI Surface PCWPF
Well 80 PC Alluvium Well GW UDI Surface PCWPF
Well 39 Weaver 1 Well GW FWTP
Well 149 Meadows D3 Well GW MWTP
Well 150 Meadows D2 Well GW MWTP
Well CR67 Meadows A7 Arapahoe Well GW MWTP
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Disinfectants Sampled in the Distribution System
TT Requirement: At least 95% of samples per period (month or quarter) must be at least 0.2 ppm OR
If sample size is less than 40 no more than 1 sample is below 0.2 ppm
Typical Sources: Water additive used to control microbes Disinfectant
Name Time Period Results Number of Samples
Below Level Sample
Size TT
Violation MRDL
Chloramine December, 2019 Lowest period percentage of samples
meeting TT requirement: 100% 0 90 No 4.0 ppm
Disinfection Byproducts Sampled in the Distribution System Name Year Average Range
Low – High Sample
Size Unit of
Measure MCL* MCLG MCL
Violation Typical Sources
Total Haloacetic
Acids (HAA5) 2019 2.07 0 to 8.7 32 ppb 60 N/A No Byproduct of drinking
water disinfection
Total Trihalo-
methanes
(TTHM)
2019 5.78 0.7 to 26.1 32 ppb 80 N/A No Byproduct of drinking
water disinfection
*MCL = Maximum Contaminant Level
Summary of Turbidity Sampled at the Entry Point to the Distribution System Contaminant
Name Sample
Date Level Found TT Requirement TT
Violation Typical
Sources
Turbidity Date/Month:
Sep Highest single measurement:
0.02 NTU Maximum 0.5 NTU for any single
measurement No Soil Runoff
Turbidity Month:
Dec Lowest monthly percentage of
samples meeting TT require-
ment for our technology: 100 %
In any month, at least 95% of sam-
ples must be less than 0.1 NTU No Soil Runoff
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Radionuclides Sampled at the Entry Point to the Distribution System Contaminant
Name Year Average Range
Low – High Sample
Size Unit of
Measure MCL MCLG MCL
Violation Typical Sources
Gross Alpha 2019 4.36 2.4 to 7.4 6 pCi/L 15 0 No Erosion of
natural deposits
Combined Radium 2019 3.7 2.4 to 4.6 6 pCi/L 5 0 No Erosion of
natural deposits
Combined
Uranium 2019 0.5 0 to 2 6 ppb 30 0 No Erosion of
natural deposits
Gross Beta Particle
Activity 2016 N/A <MRL* 1 pCi/L** 50 0 No Decay of natural and
man-made deposits
*MRL (Minimum Reporting Limit) - the smallest measured concentration of a substance that can be reliably measured by using a given analyti-
cal method, which was 4pCi/L in 2016
**The MCL for Gross Beta Particle Activity is 4 mrem/year. Since there is no simple conversion between mrem/year and pCi/L EPA considers
50 pCi/L to be the level of concern for Gross Beta Particle Activity.
Inorganic Contaminants Sampled at the Entry Point to the Distribution System Contaminant
Name Year Average Range
Low – High Sample
Size Unit of
Measure MCL MCLG MCL
Violation Typical Sources
Barium 2019 0.14 0.09 to 0.19 6 ppm 2 2 No Discharge of drilling
wastes; discharge from met-
al refineries; erosion of
natural deposits Chromium 2019 1.5 0 to 2 6 ppb 100 100 No Discharge from steel and
pulp mills; erosion of natu-
ral deposits
Fluoride 2019 0.82 0.71 to 1.06 6 ppm 4 4 No Erosion of natural
deposits; water additive
which promotes strong
teeth; discharge from ferti-
lizer and aluminum factories
Nitrate 2019 0.13 0 to 0.3 9 ppm 10 10 No Runoff from fertilizer use;
leaching from septic tanks,
sewage; erosion of natural
deposits
Selenium 2019 2.17 0 to 5 6 ppb 50 50 No Discharge from petroleum
and metal refineries; erosion
of natural
deposits; discharge
from mines
2019 Sampling Conducted at the Entry Point of the Distribution System
Parameter Name (unit of measure)
Year Average Range Low-High
Sample Size
Secondary Standard
Alkalinity (ppm as CaCO3) 2019 103 88 to 115 15 N/A
Chloride (ppm) 2019 59.5 13 to 155 15 250
Hardness (ppm as CaCO3) 2019 165 80 to 210 14 N/A
pH 2019 7.8 7.5 to 8.3 15 6.5-8.5
Sulfate (ppm) 2019 26.6 10 to 48 12 N/A
Conductivity (uS/cm) 2019 329 243 to 648 15 N/A
Sodium (ppm) 2019 28 11.3 to 38.9 6 N/A
Total Iron (ppm) 2019 0.008 0 to 0.02 15 0.3
Total Manganese (ppm) 2019 0.02 0.001 to 0.070 14 0.05
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Unregulated Contaminants***
EPA has implemented the Unregulated Contaminant Monitoring Rule (UCMR) to collect data for contaminants that are suspected to be present in drinking water and do not have health-based standards set under the Safe Drinking Water Act. EPA uses the results of UCMR monitoring to learn about the occurrence of unregulated contaminants in drinking water and to decide whether or not these contaminants will be regulated in the future. We performed monitoring and reported the analytical results of the monitoring to EPA in accordance with its Unregulated Contaminant Monitoring Rule (UCMR). Once EPA reviews the submitted results, the results are made available in the EPA’s National Contaminant Occurrence Database (NCOD) (epa.gov/dwucmr/national-contaminant-occurrence-database-ncod) Con-sumers can review UCMR results by accessing the NCOD. Contaminants that were detected during our UCMR sampling and the corre-sponding analytical results are provided below.
Contaminant Name Year Average Range
Low – High Sample Size Unit of Measure
Parts per Billion (ppb)
Manganese 2019 0.104 ND-0.52 5 ppb Total Organic Carbon 2019 2000 2000 1 ppb
Bromide 2019 140 140 1 ppb Haloacetic Acid (HAA5) 2019 1.63 0.81-3.4 16 ppb
Haloacetic acid with
Bromochloracetic acid (HAA6Br) 2019 1.67 0.4-4.7 16 ppb
Haloacetic acid (HAA9) 2019 2.98 1.2-6.8 16 ppb Cyanotoxins 2019 ND* ND 24 ppb
Germanium 2019 ND ND 5 ppb
Pesticides 2019 ND ND 36 ppb *ND—Non-detected ***More information about the contaminants that were included in UCMR monitoring can be found at: drinktap.org/Water-Info/Whats-in-My-Water/Unregulated-Contaminant-Monitoring-Rule-UCMR. Learn more about the EPA UCMR at: epa.gov/dwucmr/learn-about-
unregulated-contaminant-monitoring-rule or contact the Safe Drinking Water Hotline at (800) 426-4791 or epa.gov/ground-water-and-drinking-water.
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Non-Health-Based Violations
These violations do not usually mean that there was a problem with the
water quality. If there had been, Castle Rock Water would have
notified customers immediately. NHB violations include missed
collecting a sample (water quality is unknown), reporting the sample
result after the due date, or not completing a report/notice by the
required date. Name Description Time Period
CHLORINE/
CHLORAMINE FAILURE TO MONITOR
AND/OR REPORT Reporting period:
05/01/2019 - 05/31/2019
Infraction period:
05/02/2019 - 05/03/2019 Additional Violation Information
Describe the steps taken to resolve the violation(s), and the antici-
pated resolution date:
From the reporting period May 1, 2019 to May 30, 2019, Castle Rock
Water system missed a drinking water monitoring requirement. Castle
Rock Water is required to continuously monitor our drinking water, at
the entry point of the distribution system, for residual disinfectant
concentration at Plum Creek Water Purification Facility. An entry point-
monitoring instrument records results on four-hour intervals to ensure
that this concentration is never less than the regulatory requirement. The
results of regular monitoring are used to make sure our drinking water
meets health standards. Our Operations staff routinely places the entry
point monitoring instrument in the hold position for scheduled cleaning.
After cleaning, it is then placed back into service. However, for roughly
a 13-hour period, beginning on the night of May 2, 2019, through the
morning of May 3, 2019, our instrument remained on hold, and hence,
did not record entry point results for three consecutive intervals. This
failure to monitor is a violation of our monitoring requirements. Upon
the discovery of the error, Operations staff immediately put the entry
point instrument into service and checked the results of an upstream
instrument, which also monitors residual disinfectant concentration.
Employees verified by this instrument that, at no time during the 13
hour period was the residual disinfectant concentration below regulatory
limits at that sampling location. Additionally, eight grab samples were
taken and analyzed from the distribution system. These results were not
below the regulatory limit.
What should you do? There is nothing customers need to do.
What is being done? Controls were added to the entry point
monitoring equipment to ensure that when an Operator manually places
an instrument on hold for cleaning, the controls will automatically return
the instrument to live service in one hour if Operations staff has not
already done so. This action will prevent this kind of monitoring error
from happening in the future.
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